Update on my change from 8x1.3 pistons to 8x1.3 & 8x1.4 pistons.
With all 1.3's in and 37.5 & 32.5 oils the rear was noticeably slower with a bench drop, even with 30 in the rear.
Changed the rear to 1.4 it was about as equal as the naked eye can detect.
I want to try 35 rear oil next but I was happy with how it calmed down the rear end on small obstacles and with general rear traction in a turn.
I have gone from 35 to 30 in the rear with the 1.3's and was never satisfied.
More time at the track next time will allow me to mess around with oil weights.